50 lines
5.0 KiB
Markdown
50 lines
5.0 KiB
Markdown
# Label-field evidence at 4c9bc87
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All 24 functional tests passed: 21 normal tests and three separately isolated tests. The optional timing diagnostic also passed its exact geometry checks, but exposed severe debug-build long-field lookup cost. This is an unwired CPU Iced/Cosmic experiment, not application, WGPU paint, native responsiveness, operation-field navigation, or product font-policy acceptance.
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The tested source is [4c9bc87e4e66bba573dd63b23df5ea039f85d0ca](http://217.177.34.108:3000/sorokin.oleg.edu/ARCADIA-Studio/src/commit/4c9bc87e4e66bba573dd63b23df5ea039f85d0ca). The standalone wrapper imports that real module; it does not replace the implementation. [Source bindings](source-reference.json) identify all 11 prepared source inputs, including the font fixture.
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## Closed observations
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The strict standalone `rustc --test -D warnings` build exited 0 with an empty compile log. Its reference was the successful 8bf desktop LIST receipt, SHA-256 `e2d9258afab904c7d0d9f3efbb3c3cc02511a33296c1698b3114b3d6b7a125a1`. This reference binds dependencies and toolchain; it does not turn these tests into desktop integration tests.
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| Stage | Actual result |
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| --- | --- |
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| Literal list | Exactly 25 names; no executed-test summary |
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| Normal | 21 passed, 0 failed, 4 ignored, 0 filtered |
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| Font mutation, isolated | 1 passed, 24 filtered; actual font faces 167 to 168 and version 0 to 1; retained label and old session rejected |
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| Partial ligature field, isolated | 1 passed, 24 filtered |
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| Auto shaping/ellipsis transition, isolated | 1 passed, 24 filtered |
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| Timing, isolated | 1 passed, 24 filtered; coverage and exact geometry passed |
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Each isolated stage used a fresh process and one exact ignored test. The normal run's four ignored tests were not silently counted as passed. [Verified results](verified-results.json) preserve summaries and timing JSON; the unchanged [original attempt records](original/attempt1/) contain raw logs and receipts, including the exact commands and predecessor bindings.
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## Timing finding
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On Windows x86_64 with debug assertions and warm fonts, the diagnostic timed one resolution followed by three separate whole-field `field_layout` calls. It did not time 4,096 independent lookup calls. An independently constructed actual Paragraph oracle was computed before timing; each lookup asserted full source coverage and exact rectangle equality.
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| Input | Glyph-layout rectangles | Resolve | Three whole-field lookups |
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| --- | ---: | ---: | --- |
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| 4,096 plain scalars/graphemes | 4,096 | 0.242 s | 6.647 s / 3.877 s / 2.402 s |
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| 4,096 combining-heavy scalars, 1,024 graphemes | 1,024 | 0.111 s | 1.504 s / 1.904 s / 1.268 s |
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The actual timing font was Segoe UI. Advanced shaping, zoom 1, and a 1,000,000-unit width avoided truncation. These observations require investigation before a responsive interaction claim; they establish neither a native performance threshold nor optimized-build cost. No performance acceptance threshold was applied. The diagnostic's 19.21-second test duration also includes work outside the reported lookup samples.
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## Provenance and reproduction
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[Archive manifest](archive-manifest.json) records 29 byte-identical copied files totaling 633,185 bytes. Archival verification compared raw originals and copies, rehashed all 966 current build inputs and 32 unique current run inputs, checked before/after equality, exact list/execution membership, and every sequential receipt/log binding. No compiler or test was invoked during archival.
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The executable and runtime DLL are omitted; their inspected identities are retained in the original receipts and verified results:
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| Omitted artifact | Bytes | SHA-256 |
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| --- | ---: | --- |
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| `scenario-label-harness.exe` | 14,755,328 | `6736938b4437383d5445c3ac35d09ed188b408e7c7167b31d1e207441a246016` |
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| `libunwind.dll` | 190,464 | `aa282fa47bb2c4e210cea5e470cdbdca58568f0be0bc73e404d86ab9cd95ef6a` |
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| `NotoSans-Regular.ttf`, available at the source pin | 556,216 | `2ec33f84606cbaa0a1a944488e14f97faf2f6a25ecdd8354f5358f06da13c7d9` |
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The Noto fixture supports isolated font tests; it was not the timing font. Its unchanged [provenance](font-provenance/README.md) and [SIL OFL license](font-provenance/NotoSans-LICENSE) identify the pinned cosmic-text 0.15.0 package and original font bytes.
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For reproduction, fetch the exact published source and follow the preserved [recipe](original/README.md), supplying a matching successful desktop LIST receipt and its verified dependency artifacts to [build.ps1](original/build.ps1). Use a fresh output directory, then run [run.ps1](original/run.ps1) sequentially with stages `list`, `normal`, `font`, `ffi`, `auto-transition`, and optionally `timing`. The scripts validate local paths and hashes; archived absolute paths are provenance, not portable peer-machine paths. Global font mutation must remain isolated.
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The original recipe's preparation-only wording is historical; the closed records above are the later execution evidence. Earlier failed 11c/list experiments are not copied or relabelled here. Production wiring and GUI/native acceptance remain outside this archive.
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